Excuse the long post. There was child born in 1988 with cloacal exstophy. The babies genitalia was unidentifiable. During surgery internal testicles were removed. The baby spent their first year being raised as a boy and at one year old it was decided that it would be psychologically better for the baby to be raised as a girl. The Drs were under the impression that it didn't really matter, a child without genitalia could be raised either sex and it be fine.
For the next approximately 20 years the child was raised as a girl, chromosomal testing was done for medical reasons and it was discovered they had the XY chromosome. He decided he was a man. He has spoken of always feeling like something wasn't quite right, he had struggled spending many years trying to convince himself and everyone else that he was something he wasn't.
I know most of mumsnet agree that gender is dysphoria is a very real condition and simply question how gender identity law can be exploited by those not genuinely suffering with it and how it will infringe on others rights. But I do believe there are some who question that you can be born in the wrong body at all. If sex is truly only about genitalia then why did this man feel so distressed by the years of living as female? Is it some evidence that sex and gender are more than just biology?
I'm not being goady, I feel it's a valid thing to question.